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Benefit Plans (Components of net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on benefit obligation   $ 378 $ 388 $ 444
Expected return on plan assets   (452) (554) (546)
Amortization of unrecognized actuarial net loss   214 242 279
Settlement loss   128 269 235
Net periodic benefit cost   $ 268 $ 345 $ 412
Scenario, Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on benefit obligation $ 306      
Expected return on plan assets (488)      
Amortization of unrecognized actuarial net loss 205      
Net periodic benefit cost $ 23